The 4th gen V8 cars had 3.42s in the six speeds and 2.73s in the automatics. However, the automatic also had the GU5 axle option which gave you z-rated tires, removed the speed limiter, and a 3.23 to 1 axle ratio. I have it on my car and it isn't bad at all. Being primarily street driven I wouldn't go lower than 3.42 if I were to change them out. It would be nice to see a couple of choices though, especially with the rumor of the 6L80E being the automatic to go in the car. The older 3rd gens were pretty long winded. My '89 RS had a 350 turbo in it and had absolutely no low end due to only having three gears.

Yeah my transmission was swapped before I bought the car. It also had a 350 out of a truck. It still had the stock throttle body injection. I was 18 then and had no idea about anything other than engine sizes and how many gears a few of the GM transmissions had. Now that I look back I never should have traded that car in. It needed simple things to fix to make it just a nice, clean ride. The body on it was flawless and it was a non T-top car. Other than performance parts, It probably needed about $1000 worth of parts that I could have installed myself to be cherry. Oh well live and learn I guess.

I had a 2002 Z06 LPE TT that put 600+hp to the wheels w/ 3.73. I had no problems with my IRS. Never really dogged too hard out the hole...1.6 to 1.7 60ft times. Would post a video but don't know how :(